Chapel

From Churches of Rome Wiki

A chapel is a building or room designed for worship, typically attached to an institution such as a hospital, prison or university. It might be a separate structure, a room within a church or a room within the institution it belongs to. The main difference between a chapel and a church is ownership and usage; a church is generally a public building while a chapel is private or set aside for a specific purpose.

A chapel is also normally smaller than a church, but this is not a defining factor; for instance, the Cappella Sistina is much larger than many churches, but it is still a chapel.